Scanjet 7800 - Driver error (#281,-4523)

Running Windows Vista. Have had no problems with scanner until about 2 weeks ago when it just refused to scan and kept showing me "scanner driver error (#281,-4523)". HP support says it is out of warranty and they won't even sell me a service call. Have tried to reinstall driver and software, but nothing seems to work. Input much appreciated.

Re: Scanjet 7800 - Driver error (#281,-4523)

Had scanner for a few years with aboslutely no problems. Then one day it just started giving me the error message. When I click on scan the only thing I get is the Scanner driver error (#281, -4523). I've redownloaded the available driver from the HP site and still it does not work